CVE-2026-106487

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-106487", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-06T18:46:47.766Z", "datePublished": "2026-10-06T20:36:45.419Z", "dateUpdated": "2026-10-09T01:49:45.471Z"}, "containers": {"cna": {"title": "Backstage: Unsupported catalog cluster authentication mode in kubernetes backend", "problemTypes": [{"descriptions": [{"cweId": "CWE-441", "lang": "en", "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"}, {"name": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946", "tags": ["x_refsource_MISC"], "url": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"}, {"name": "https://github.com/backstage/backstage/releases/tag/v1.54.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"}], "affected": [{"vendor": "backstage", "product": "backstage", "versions": [{"version": "< 1.54.6", "status": "affected"}]}, {"vendor": "@backstage", "product": "plugin-kubernetes-backend", "versions": [{"version": "< 0.21.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-06T20:36:45.419Z"}, "descriptions": [{"lang": "en", "value": "Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10."}], "source": {"advisory": "GHSA-h53x-hjx6-25gr", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-09T01:49:36.578700Z", "id": "CVE-2026-106487", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-09T01:49:45.471Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-106487", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-09T01:49:36.578700Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-09T01:49:41.246Z"}}], "cna": {"title": "Backstage: Unsupported catalog cluster authentication mode in kubernetes backend", "source": {"advisory": "GHSA-h53x-hjx6-25gr", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 3.5, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "backstage", "product": "backstage", "versions": [{"status": "affected", "version": "< 1.54.6"}]}, {"vendor": "@backstage", "product": "plugin-kubernetes-backend", "versions": [{"status": "affected", "version": "< 0.21.10"}]}], "references": [{"url": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr", "name": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946", "name": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/backstage/backstage/releases/tag/v1.54.6", "name": "https://github.com/backstage/backstage/releases/tag/v1.54.6", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-441", "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-06T20:36:45.419Z"}}}, "cveMetadata": {"cveId": "CVE-2026-106487", "state": "PUBLISHED", "dateUpdated": "2026-10-09T01:49:45.471Z", "dateReserved": "2026-10-06T18:46:47.766Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-10-06T20:36:45.419Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "backstage", "vendor": "backstage", "versions": [{"status": "affected", "version": "< 1.54.6"}]}, {"product": "plugin-kubernetes-backend", "vendor": "@backstage", "versions": [{"status": "affected", "version": "< 0.21.10"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:backstage\\/plugin-kubernetes-backend:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "11B8BD51-68C6-4620-B96B-7F49CA782148", "versionEndExcluding": "0.21.10", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*", "matchCriteriaId": "630B6B8B-D515-4FEF-83C7-9CF51C7EB2F5", "versionEndExcluding": "1.54.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10."}], "id": "CVE-2026-106487", "lastModified": "2026-10-22T18:49:32.183", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-106487", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-09T01:49:36.578700Z", "version": "2.0.3"}}]}, "published": "2026-10-06T21:17:17.477", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Release Notes"], "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-441"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "plugin-kubernetes-backend: plugin-kubernetes-backend: Information disclosure via catalog cluster authentication handling", "id": "2547193", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547193"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-478", "details": ["Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.", "A flaw was found in the plugin-kubernetes-backend component of Backstage. In environments configured for catalog cluster discovery, an authenticated catalog contributor can define an unsupported authentication mode on cluster resource entities. This vulnerability allows the backend to query the local cluster interface using its own service identity, potentially leading to unauthorized information disclosure of internal cluster resources permitted by its role-based access control (RBAC) configuration."], "name": "CVE-2026-106487", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-10-06T20:36:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-106487\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-106487\nhttps://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946\nhttps://github.com/backstage/backstage/releases/tag/v1.54.6\nhttps://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.54.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "backstage", "source": "cna", "vendor": "backstage"}, "product": "backstage", "vendor": "backstage"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.21.10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "plugin-kubernetes-backend", "source": "cna", "vendor": "@backstage"}, "product": "plugin-kubernetes-backend", "vendor": "backstage"}], "created": "2026-10-07T00:15:07.175417+00:00", "updated": "2026-10-09T08:31:32.757406+00:00", "vendors": ["backstage", "backstage$PRODUCT$backstage", "backstage$PRODUCT$plugin-kubernetes-backend"]}